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Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Uspring wrote ...
The OP posted a band reject filter, rejecting the tanks resonant frequency.
I thought he might have measured across the LC tank, making it a bandpass, but you're right, he just confirmed that he measured across the resistor. The posted waveforms look more like what I would expect from a bandpass though, with a lot of third harmonic getting through and just a bit of the fundamental, but I'm a bit confused as the circuit he describes is a band reject as you say. Is there something else funny going on, is it a measurement error, or am I just misunderstanding the whole thing?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The distortion of the input sinewave is not evenly distributed, with much of the harmonic energy concentrated in the peaks. When these harmonics are blocked by LC, the output peaks are attenuated.
The 12 kHz picture suggests, that the fundamental is suppressed and mostly the 3rd harmonic left over. Mysterious to me. If the OP wouldn't have just confirmed a f0 of 40kHz, I would have thought, he got the inductance wrong, e.g. 2mH instead of 0.2mH.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
The reason I think it’s behaving like a band pass, is the output impedance is much greater than the input impedance (the signal generator output). Any magnification due to Q is mostly going to appear across the 3.3k resistor, As already mentioned along with a significant part of the input frequency. Differing phase shifts adding probably give the peculiar waveforms. Incidentally using Q = r x ( square root of C/L) got the value of 74, with the 3.3k load. Edit, Not technically correct as the component losses are unknown and haven’t been taken into account so should have said Q wouldn’t be higher than 74.
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Strange RLC Waveform
